Heat loss

[EdRedBird]

With weather getting colder I am noticing the van cools of quicker than last winter (Even Jan this year when it was freezing) and the only difference is my big roof extractiion fan.
Maybe logical I cut a big square hole in roof and insulation and allm that seperates inside from outside is a sheet of plastic
OR is there something else amiss

If I am right what would be a solution to insulate the roof fan while not in use

(This morning I got the van up to 20c and i lost 3 degrees in a little more than 30 minutes with an outside Temp of 12)

 

[TheBig1]

sheet of celotex or similar cut to fit works well or make some "silver screens" using foil bubble insulation etc

 

[Guigsy]

I find wind takes the heat out of the van very quickly.

 

[Two on Tour]

I made up pads from a few layers of silvered bubble wrap insulation bonded together that I fit into our skylights on cold nights, plus it does a good job of reducing the heat in our van when the sun is blazing down on the roof although I leave the skylights open then so as not to damage the clear plastic covers. I also fit pads like these between the blinds and the side window in cold weather.

 

[EdRedBird]

Thanks all for confirming
As mine is the size of a floor tile ... Velcro , floor tile and maybe some extra fluff will do the job neatly

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